590 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [52] 



Dr. Asper has also been successful iu hatching eggs of the American 

 Coregonus, and has placed some young ones in the lake. 



14. Geneva. — In the quarter of Geneva known as " Sous Saint Jean," 

 is located the fish-cultural establishment belonging to the canton of 

 Geneva, which at present is under the direction of Mr. Covelle. 



The water comes from the Lake of Geneva, and is the same which is 

 used as drinking water in the city. In winter its temperature is 6° C. 

 [42.8° F.] and sometimes it falls to 4° C. [39.2° F.] ; in summer it is 

 very warm, but during that season no operations are carried on in the 

 establishment. Generally it is not filtered, but when a north wind (the 

 so-called u bise") prevails, it becomes turbid, and at that time it is, when 

 coming out of the faucets, made to pass through a zinc box divided into 

 two compartments, half filled with gravel. Mr. Covelle, however, pro- 

 poses to substitute for these apparatus a large filter, to be placed out- 

 side the building. 



The water runs along the walls of the hatching-room, which is 13 me- 

 ters long and 12 broad [nearly 43 x 40 feet], in iron pipes, which are 

 preferable to wooden ones, because parasitical fungi are not so apt to 

 form in them, 



In the hatching-room there are 2S troughs, placed in two double rows, 

 each containing 7; they are cemented. 2\ meters long and 70 centi- 

 meters broad [about 9S x 28 inches] on the inside. The one standing 

 agaiust the wall is 20 centimeters [nearly 8 inches] higher than the outer 

 one. For each trough there is a faucet, to which is attached a winding 

 appendage of brass, with a small hole at the end ; so the water does not 

 flow out more thau at the rate of 6 liters [about 6£ quarts] per minute. 

 Inside this tube is placed a small grating, which prevents all matter 

 from stopping up the hole. The water iiows from the upper trough into 

 the lower one through a zinc pipe, to which is attached a distributing 

 apparatus, which may also be attached to the upper faucet. The lower 

 troughs have as an outflow a straight iron pipe, terminating at the top 

 in a small grate. 



These pipes, joined two and two, lead to a conduit under the pave- 

 ment, which ends in a large basin placed at the end of the room, which 

 serves for keeping, separately, the male and female propagating fish. 



For hatching Coregonus eggs the funnel-shaped apparatus already re- 

 ferred to is used. It is provided with a metal edge with a vertical 

 grate, which runs along a peripheric canal, whose opening communi- 

 cates with the conduit of the edge, from which the young fish and the 

 spoiled eggs fall, while the good oues remain at the bottom. 



The hatching frames which Mr. Covelle places in the large troughs 

 have a bottom of metal wire with very narrow interstices. I think, 

 however, that a network with larger openings is preferable, which would 

 allow the young fish to pass through soon after they are hatched. The 

 bottom of the troughs is generally covered with very line gravel. 



